Year | Value | 2022 | 80.55 | 2021 | 80.379 | 2020 | 80.149 | 2019 | 79.983 | 2018 | 80.614 | 2017 | 78.59 | 2016 | 79.475 | 2015 | 79.309 | 2014 | 79.966 | 2013 | 78.908 | 2012 | 79.022 | 2011 | 78.827 | 2010 | 78.406 | 2009 | 78.236 | 2008 | 78.068 | 2007 | 77.892 | 2006 | 77.726 | 2005 | 77.555 | 2004 | 77.384 | 2003 | 77.206 | 2002 | 77.031 | 2001 | 76.847 | 2000 | 76.663 | 1999 | 76.502 | 1998 | 76.326 | 1997 | 76.154 | 1996 | 75.98 | 1995 | 75.821 | 1994 | 75.654 | 1993 | 75.483 | 1992 | 75.327 | 1991 | 75.917 | 1990 | 74.463 | 1989 | 74.233 | 1988 | 74.226 | 1987 | 73.581 | 1986 | 73.449 | 1985 | 72.617 | 1984 | 72.795 | 1983 | 72.624 | 1982 | 73.018 | 1981 | 72.665 | 1980 | 72.487 | 1979 | 72.387 | 1978 | 72.302 | 1977 | 72.235 | 1976 | 72.226 | 1975 | 72.118 | 1974 | 71.961 |
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